PCAT PCAT Genetics

Question 1

What is the probability of two heterozygous parents (Aa × Aa) producing a homozygous recessive offspring?

Accepted Answer

25%

Answer

50%

Answer

75%

Answer

100%

Question 2

Which type of mutation involves the insertion or deletion of a nucleotide that causes a shift in the reading frame?

Accepted Answer

Frameshift mutation

Answer

Point mutation

Answer

Silent mutation

Answer

Missense mutation

Question 3

In incomplete dominance, what is the phenotype of a heterozygous individual?

Accepted Answer

An intermediate phenotype

Answer

The dominant phenotype

Answer

The recessive phenotype

Answer

An unpredictable variable phenotype

Question 4

What term describes genes located on the same chromosome that tend to be inherited together?

Accepted Answer

Linked genes

Answer

Alleles

Answer

Homologous genes

Answer

Codominant genes

Question 5

Which RNA molecule carries genetic information from the nucleus to the ribosomes?

Accepted Answer

mRNA

Answer

tRNA

Answer

rRNA

Answer

snRNA

Question 6

What is the process by which mRNA is used to synthesize a protein at the ribosome?

Accepted Answer

Translation

Answer

Transcription

Answer

Replication

Answer

Transduction